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When choosing die-casting lighting parts, heat dissipation is the core factor to be considered first, which directly affects product performance and lifespan. The following are key considerations:
1. Core guarantee for the lifespan of the light source
All light sources (LEDs/traditional light bulbs) experience accelerated light decay at high temperatures, and poor heat dissipation can shorten their lifespan by several times.
As the main heat dissipation path, the die-casting shell needs to efficiently dissipate the heat of the chip to avoid temperature accumulation and burning of the driving parts.
2. The key to the stability of light efficiency
High temperature causes LED color deviation (such as yellowing of white light), a decrease in color rendering index, and affects lighting quality (such as museums and operating rooms have strict requirements for light color).
Insufficient heat dissipation can trigger the overheating protection of the light source, causing flicker or brightness fluctuations.
3. Direct causes of security risks
Excessive surface temperature of parts may cause burns (such as wall lamps and desk lamps that can be touched by human hands).
Continuous high temperature accelerates the aging of the circuit, increasing the risk of short circuits and fires (especially for enclosed lighting fixtures).
4. Potential threats of structural deformation
Local overheating of metal die-casting parts generates thermal stress, which can lead to deformation or cracking due to long-term cold and hot cycling (such as the temperature difference between winter and summer in outdoor lighting fixtures).
Sealing gaskets and plastic accessories are prone to brittleness at high temperatures, which can damage their waterproof and dustproof performance (commonly seen in inferior street lamps).
5. Ground constraints for heat dissipation design
Material selection: Aluminum alloy die-casting needs to balance thermal conductivity and strength (for example, ADC12 has better thermal conductivity than A380 but slightly lower strength).
Structural process:
The thickness/spacing of fins should balance the heat dissipation area and the feasibility of die-casting demolding;
The contact surface between the shell and the light source must be flat, and the gap should be filled with a thermal conductive medium (such as silicone grease).
Space layout: Compact lighting fixtures require the design of winding air ducts or integrated heat sinks within a limited volume.
